I wouldn't jump so immediately to that conclusion, akiranyo. at first, i also thought this was uncannily similar to arya3087's wall, but then again, the screenshot is out there for anyone to vector. not to mention there are differences between the walls. arya's version - (patterns + text + jaggedness) + shading + blurred mouth = this version.

but because of the similarity and the lack of additional work to garnish the image, it probably would not be a good idea to continue with this unless you are prepared to do lots of work to differentiate it from arya's piece.